Import libint-2.0.0 as math/libint


Libint is two things:
1. a library of C/C++ functions for efficient evaluation of
several kinds of two-body molecular integrals over Gaussian
functions;
2. the optimizing compiler that generates a Libint library.

In molecular electronic structure theory Gaussian basis sets are
standard because they allow efficient evaluation of matrix
elements of operators (molecular integrals). Modern electronic
structure programs spend considerable portion of their runtime
computing the Coulomb two-electron integrals. While anyone can
compute Gaussian integrals using simple formulas, the efficient
evaluation of many-body can be (relatively) complicated.
Libint is an open library that anyone can use to compute a
variety of two-electron integrals, most importantly the Coulomb
two-electron integrals and their arbitrary-order geometric
derivatives, over Gaussians of arbitrary angular momentum.
Among other notable features is the support for the nonstandard
two-electron integrals that appear in explicitly correlated R12
methods.
Update to 1.20.3

Upstream changes:
MediaWiki 1.20.3

This is a security and maintenance release of the MediaWiki 1.20 branch.
Changes since 1.20.2
New preference type - 'api'. Preferences of this type are not shown on Special:Preferences, but are still available via the action=options API. (Unbreaks MLEB.)
(bug 44010) Context is passed to UserGetLanguageObject.
The recursion guard on RequestContext::getLanguage() was weakened.
(bug 40585) Don't drop 'step="any"' in HTML input fields.
(bug 44024) Fixed problems in ObjectCache when using XCache.
(bug 44010) FauxRequest leaked cookie data from primary request.
(bug 44135/bug 42441) Pass '2' instead of 'true' to CURLOPT_SSL_VERIFYHOST
(bug 43518) API action=unblock should return the user name, not the full user object
(Bug 45355) Prevent read of arbitrary files through mwdoc-filter.php
Updated www/mediawiki to 1.20.3
+ clutter-gst-2.0.2, gettext-0.18.2.1, gnome-keyring-3.6.3,
  gssdp-0.14.2, gupnp-0.20.1, kde-4.10.1, libgee-0.8.5, lzip-1.14,
  milter-manager-1.8.6, modular-xorg-server-1.14.0, paexec-0.18.0,
  snort-2.9.4.1, wireshark-1.8.6.
wireshark already done, actually.